George h



` (No Model.)

G. H. HOLMES.

SAW. No. 397,646. Patented Peb. 12, 1889.

ATTR/VEKY.

UNITED STATES PATENT OFFICE.

lEORGE H., HOLMES, OF OGDENSBURG, NEWv YORK.

SAW.

SPECIFICATION forming part of Letters Patent No. 397,646, dated February 12, 1889.

Application led March 30, 1888. Serial No. 268,952. (No model.)

To all whom it may concern.'

Be it known that I, GEORGE I-I. HOLMES, of Ogdensburg, in the county 'of St. Lawrence and State of New York, have invented a new and Improved Band-Saw, of which the following is a full, clear, and exact description.

This invention relates to an improvement in band-saws, and has for its obj ect to provide band-saws which will be effective and durable.

The invention consists in a band-saw constructed as hereinafter described and claimed.

Reference is to be had to the accompanying drawin Os, forming a part of this specification, in which similar figures of reference indicate corresponding parts in both the views.

Figure lis a side view of a portion of a band-saw constructed in accordance with my invention, and Fig. 2 is a horizontal section.

In operation the back of a band-saw blade runs against friction-plates, friction-wheels, or pins made of steel and hardened. The back of the savr cuts into these friction-supports and sticks in the kerf so formed, thereby subjecting the saw-blade to torsional strain and jar caused by the crookedness of the lumber in resawing or from the variation in the log or log-carriage. As the edge of the saw is forced aside, the back thereof tends to follow it, but being held from lateral movement by the kerf above mentioned cannot respond to the movement of the cutting-edge, and is bent sharply while traveling at a high rate of speed, thereby causing the back of the blade, which is as hard as the cutting-edge, to break or crack. In order to overcome this ob jection the following has been devised:

I take a band-saw, l, and form it with the usual hardened or tempered cutting-edge, 2, and anneal the back of the sawto a distance from its edge 4c of about an inch. By this means a band-saw is provided having a hardened or tempered cutting-edge and an annealed back. The back of the saw being softer and more dnctile than the cutting-edge will yield and accommodate itself to the movement of the-cutting-edge although held by the kerf formed in the friction-support, thereby relieving the saw from the torsional strain and jar above mentioned and from danger of cracking or breakin coming the objections noted and to reduce the leverage on the steel in the blade, the back of the blade may be ground about two gages thinner, to a depth from the edge 4 of about three-eighths of an inch, forming the diminished portion 5. by this structure, together with the annealed back and hardened cutting-edge, as described, a band-saw is provided which will work smoothly and effectively and which will not crack or break.

I am aware that a band-saw having a soft back and high-tempered hard teeth is old, as also a band-saw having milled teeth and a blade beveled only on converging lines from the teeth, and to such I lay no claim.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- A band-saw for cutting wood, having an annealed back, and the restof the blade and cutting-edge tempered with the ordinary temper of wood-saws, the back of the blade being thin and the rest of the blade of even thickness, substantially as shown and described.

;EORGE Il'. HOLMES.

lVitnesses:

EDWARD W. Conv, EDGAR TATE.

To further aid in over- 

